package Shiar_Sheet::ImagePrep;
-use 5.014;
+use 5.020;
use warnings;
+use experimental 'signatures';
-our $VERSION = '1.00';
+our $VERSION = '1.02';
-sub new {
- my ($class, $target) = @_;
+sub new ($class, $target) {
bless \$target, $class;
}
-sub download {
+sub download ($target, $download) {
# copy changed remote url to local file
- my $target = shift;
unlink $$target if -e $$target;
- my $download = shift or return 1;
+ defined $download or return 1;
require LWP::UserAgent;
my $ua = LWP::UserAgent->new;
$ua->agent('/');
or die "Download from <q>$download</q> failed: ".$status->status_line."\n";
}
-sub convert {
- my ($imgpath, $thumbpath, $cmds) = @_;
+sub dimensions ($imgpath) {
+ require IPC::Run;
+ IPC::Run::run(
+ [identify => -format => '%w %h', $$imgpath],
+ '<' => \undef, '>&' => \my $xy
+ ) or die ["Image dimensions could not be determined.", $$imgpath];
+ return split /\s/, $xy, 3;
+}
+
+sub generate ($imgpath, $thumbpath, $opt) {
if (not -e $$imgpath) {
- return unlink $thumbpath;
+ return !-e $thumbpath || unlink $thumbpath;
}
+ my @cmds = @{$opt->{convert} // []};
+ unshift @cmds, -area => $_ for $opt->{crop32} || ();
+ $imgpath->convert($thumbpath, \@cmds, '300x200') and # low-res cover
+ $imgpath->convert($thumbpath =~ s/\.jpg$/.webp/r,
+ [@cmds, -quality => 40], '600x400' # higher dpi tradeoff
+ );
+}
- my $xyres = 0 ? '600x400' : '300x200'; # cover
- my @cmds = @{ $cmds // [] };
+sub convert ($imgpath, $thumbpath, $cmds, $xyres) {
+ #my ($w, $h) = $imgpath->dimensions;
+ #my $aspect = 3/2; # $xyres
+ my @cmds = @{$cmds};
if (my ($cmdarg) = grep { $cmds[$_] eq '-area' } 0 .. $#cmds) {
# replace option by permillage crop
my @dim = map { $_ / 1000 } split /\D/, $cmds[$cmdarg + 1];
+ $dim[$_] ||= 1 for 2, 3; # optional end
+ push @dim, $dim[2 + $_] - $dim[$_] for 0, 1; # add width, height
splice @cmds, $cmdarg, 2, (
+ #crop="%[fx:floor(w*$ratio)]x%[fx:floor(h*$ratio)]"
+ #crop="$crop+%[fx:ceil((w-w*$ratio)/2)]+%[fx:ceil((h-h*$ratio)/2)]"
-set => 'option:distort:viewport' => sprintf(
- '%%[fx:w*%s]x%%[fx:h*%s]+%%[fx:w*%s]+%%[fx:h*%s]',
- ($dim[2] || 1) - $dim[0], # width = x2 - x1
- ($dim[3] || 1) - $dim[1], # height = y2 - y1
- @dim[0, 1] # offset = x1,y1
+ '%%[fx:%s]x%%[fx:%s]+%%[fx:%s]+%%[fx:%s]',
+ "w*$dim[4]", "h*$dim[5]", # width x height
+ #"max(w*$dim[4], h*$dim[5]*$aspect)", # width
+ #"max(h*$dim[5], w*$dim[4]/$aspect)", # height
+ "w*$dim[0]", "h*$dim[1]", # x+y offset
),
-distort => SRT => 0, # noop transform to apply viewport
);
'convert',
$$imgpath,
-delete => '1--1', -background => 'white',
+ '-strip', -quality => '60%', -interlace => 'plane',
-gravity => defined $cmds ? 'northwest' : 'center',
@cmds,
-resize => "$xyres^", -extent => $xyres,
- '-strip', -quality => '60%', -interlace => 'plane',
$thumbpath
);
+ $imgpath->runcommand(@cmds);
+}
+
+sub runcommand ($, @cmds) {
require IPC::Run;
my $output;
IPC::Run::run(\@cmds, '<' => \undef, '>&' => \$output) or die [